7857225 has 36 divisors (see below), whose sum is σ = 14391936. Its totient is φ = 4095840.

The previous prime is 7857211. The next prime is 7857233. The reversal of 7857225 is 5227587.

It is not a de Polignac number, because 7857225 - 2⁸ = 7856969 is a prime.

7857225 is a lucky number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 7857225.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10204 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (399776).

Almost surely, 2^7857225 is an apocalyptic number.

7857225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7857225 is a deficient number, since it is larger than the sum of its proper divisors (6534711).

7857225 is a wasteful number, since it uses less digits than its factorization.

7857225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 798 counting only the distinct ones).

The product of its digits is 39200, while the sum is 36.

The square root of 7857225 is about 2803.0742052254. The cubic root of 7857225 is about 198.8030592881.

The spelling of 7857225 in words is "seven million, eight hundred fifty-seven thousand, two hundred twenty-five".